THE ETHIOPIAN REGION 



119 



Theropithecus, containing two species of terrestrial baboons, 

 which inhabit Abyssinia and the Galla country. 



The other genera of African monkeys are fairly repre- 

 sented here, though by no means so abundantly as in the 

 West African Sub-region. 



The Saharan Sub-region, therefore, is characterized by 

 the exclusive possession of the following genera : — 



(1) Ammodorcas, Lithoeranius, and Addax among the 

 antelopes. 



(2) Lophiomys (forming a distinct family), Heteroce- 

 phalus, and Pectinator among the rodents. 



(3) Theropithecus among the Monkeys. 



The following families, found in other parts of Africa, 

 are absent from this Sub-region : Tragulidse (chevrotains), 

 Protelidie (aard-wolf), Potamogalidm (river-shrews), Chry so- 

 chloride (golden moles), and Simiide (the anthropoid apes). 



The following is the summary of the mammals inhabit- 

 ing the Saharan Sub-region : — 



Section VIII. — The Past History of the Ethiopian 

 Mammal-fauna 



Up to the present time palaeontology has afforded us 

 little assistance in tracing out the past history of the 

 African Mammal-fauna. With the exception of a few still 



